Needle-locking device for syringes



l Mgy 6, 1930. J. B.'NEI|.. 1,757,580

NEDLE LOCKING DEVICE FOR SYRIGES Filed Feb. 8. 1929 @QQ-l III lmlunhnyllml Patented May 6, 193()k i' i' UNI-TED' STATES Y* Application learebruary s, l1929. senat No. 338,534.

The present invention relates to syringes, Y and particularly to means for locking a needle to syringes. 'l

Y It has been found inmedical practice that often the needle base of syringes and hypodermics accidentally becomes dislodged, and either falls olf or permits the escape of the Y fluid or the entrance of Vair into the Huid. The` consequences resulting are notonly annoying, but, in a to the patient. Y

The object of the invention is toprovide van air-tight and Huid-tight coupling.y K

' Another object lof the invention -is to provide a coupling which is simple in operation, and can be easilyand quickly manipulated.V

Another object of the invention is to pro- V vide a device which can be cheaply manufactured, and is not prohibitive in price; Y Still 'another object ,of the invention is to provide means whereby a positive connection may be obtained, where the failure of such might have extremely harmful results.

The invention can be applied to a number of surgical and clinical instruments 'where aV secure joint is necessary and required, for example, the cystoscope and urethroscope, where the materialis of such consistency as to permit the making of grooves therein. In the drawings Figurel is a side view ofthe in cross section. Y

Figure 2 is an enlargedeview tion of the locking device..V

syringe'partly in cross secshowing the arms. f

Figure 4. is a perspectiveview of the 'barrel' showing the slots throughthe abutment intoV great -many cases, dangerous l8 is a gr0ove`l0,"bordered,on one sideby theV shoulder?, and on the other'side by an abut- Figure 3 is a plan view ofthe needle base Figure'shows a modified form, inV which Thev Vpiston. 2has l is seated a` splitringfG This element isvfully y explained. and claimed in LettersfPatent No. 1,343,787, issued June 15th,'1920. Y At the needle end of the barrel is a'shoulder 7 from'which extends the nipple 8, the latter preferably, though not necessarily, being slightly tapered. A passageway 9 runs from the interior-of the barrel through the said nipple.

lormecl'atthe innermost end of the nipple mentll; "It will'be noted that the side l2 of the abutment, adjacent the groove, is slightly `undercut and 'forms an acute angle. Sglotsfil are l'provided on'opposite nsides of thelnippleand extend through` the abutment into the groove.' f Y Y The needle baselt, which Vis Ausuallyformed of metal,"but may be `of other suitable material, contains a socket l'shaped exactly to fit the nipple 8.*v v A passagewayl runs from within thesocket to the needle and connects with the passageway Y9 in the nipple. Integrallypor otherwise attached to the needle baseareV armsjl'jhoolied at their ends, asV

f.' The said arms will be in a position to enf gage the groove when the.v tapered nipple is substantially against thefbottom of the socket in the needlebase.- l/Vhen in this position,

soY

the 'desired air-tight and yfluid-tight joint is 5 made, andV by turning` the arms kinto the groove, thepositive lockingvmeans is provided.

QTwo indentations 19 areffor-med on they opposite `sides of the needlebase Vto provide means 'forl grasping'` with the thumb and fingers. ,p

A modified form of the invention is shown in Figure'f..` The groovevl'O extends only around part of the circumference of the VI'nipple,and in this way a -stop is formed.

fTo Aassemble the'devi'ce theneedle base` is grasped at the indentations and tted over the nipple, the arms are slipped along the nipple and through the slots in the abutment, and a quarter turn of the needle base is made; In this Way the needleb'ase is positively secured to the barrel Without fear ofthe possibilityeither oibecoining entirely dislodged,

or loose, whereby leakage mightoccur.

Such structuralchanges, vvhich call merely for mechanical skill, are, ofcourse, to be considered as within the rangeof my invention.l

Iclaim:-V Y A. Y

l. In a syringe, the combination offabarrel having anipple provided-.with a groove be.Y

tween the barrel and the free end'of'said nipple, a needle carrier adapted to engagey said nipple, and resilientgrooveengaging means on said carrier 4to enter the groove when -said carrier engagessaid nipple and hold the parts.y in operative f'i'elation. s 2. In a -syringe,the combination. of a barrel havinga nipple provided with Va groove between the barrel and Vthezfjfree end-ofsaid nipple, a needle carrier adapted to engage said nipple, and spring arms on said'carier having groove-engaging members to enter the groove when .said carrier engages said nipple and hold the parts in operativerrelation. v 3. In asyringe, thecombination of a barrel having Ya ,nipple Y provided with a groove between the .barrel and the ree'en'd ofv said nipple, a needle carrier adapted to engage said nipple by a straight-line-'inovemena resilient means on vsaid carrier registering with thelgroove upon ,engagementfof'lsaid carrier with said nipple, said resilient means adapted to engage the groove and lock the parts inoperative relation upon relative rotation of said carrier and nipple.

4. In a syringe, the combination of a bar-k rel having a knipple providedwith agroove between the barrel and the free end ofsaid nipple, a needle carrier kadapted .to engage said vnipple by a straight-line movement, spring arms on said carrier registering with the groove upon engagementof said carrier With said nipple, saidspring arms adapted to engage the groove and lock the parts-in operative relation upon relativerotation of said carrier nipple. A .'5. In a syringe, the combination of a barrel Vhaving a nipple provided With a groove between the barrel and the`ffree endv ofsaid ni ple, a needle carrier adapted to vengage said nipple by" a straightline movement, spring arms having groove engaging hooks on said carrier registeringvvith the groove 'upon `engagement of said carrierwith said nipple, said spring yarms adapted to engage the lgroove andlockf the partsin o lerative relation upon relative'rotation of sai carrier `and nipple.t A

6. In a syringe, .the combination of abar- .1121 having a nipple, @ebenda @Said nipple spaced from said barrel to form a groove, a needle-carrier having a nipple-engaging socket to engage said nipple by a straighty linenmovement, and a plurality of spring arms on said carrier providedvvith shoulder engaging Vmeans to lock the parts in operative relation upon relative rotation of said v nipple and carrier.

I 7. VIn asyringe, the combination of a barrel having a nipple, an undercut shoulder on V-said'-nipplespaeedifreni said barrel to form a groove, a needle-carrier having a nipple-en- Hgagingsocketfto' 'engage said nipple by a straight-line movement, and a plurality of spring arms n said' carrier provided With shoulder engaging hook portions tolockjthe 4partsin operative vrelation,uponrelative rotation ofsaid nipple and carrier. Y Y

8. Ina syringe, the combination of 'a barrel having a nipple, a shoulder onsaidnippl-e spaced from said barrel toztorm a .groove and provided With av plurality fot .symmetrically disposed notches,-aY needle-carrier to engage said nipple, and springarms-onfsaid carrier having hook portions ,to V'enter said notches and upon .relative rotation of said nipple n and carrier lockthe parts inoperative relation.Y l .l 1

' 9. In a syringe,[the combination of aA barrel having-.a nipple,-anotched shoulder on saidnipple spaced vfrom said barrelto form a groove the -bottoingof which is substantially in theplane of the Wall of said nipple,.a needle carrier. having a -nipple.-engagingv socket, and

resilient. groove-engaging members y on saidV carrieradapted-to ride thevvall oiisaid nipple through the .notches in said shoulder, and upon relative rotation of said nipple and-earrier engagethe grooveand look theparts in operative relation.

. 5 10. Ina syringe, the Lcombination of a barll. In asyringe, the combinationof abar- Y. Y

rel having a tapered nipple, a notchedshouL Vder on saidnipple spaced from said Vbarrel toV form a groove the bottom of Which is substantially in the plane ofthe Wall of said nipple, a needle'carrier having'a taperednipple-en-v gaging socket, and resilient groove-engaging members on saidcarrieradaptedto ride the Wall of saidY nipple'throughy the notches'in said shoulder,;and upon relative rotation of said nipple and. carrier engage.. the'groove and lock inoperative relation.y Y

l2. In a'syringe, thefcombination of a barrel having a nipple, a notched shoulder on said nipple spaced from said barrel to form a groove the bottom Aof which is substantially in the plane of the Wall of said nipple, a needle carrier having Va nipple-engaging socket, nger grips on said carrier, and resilient groove-engaging members on said carrier adapted to ride the wall of said nipple through the notches in said shoulder', and upon relative rotation of saidnipple and carrier engage the groove and look the parts in opera-tive relation. v

13. A syringe barrelhaving a nipple projecting therefrom and provided with a notched shoulder to form a groove between the barrel and the free end of the nipple, the

outer Wall of the nipple being insubstan' tially the plane of the bottom of the groove.

14. A needle carrier for syringes having a nipple-engaging socket provided With inger grips, and resilient syringe-engaging arms projecting from the said carrier.

l5. A needle Carrier for syringes having a nipple-engaging socket provided with nger grips, and resilient syringe-engaging arms projecting from-the said carrierand having inwardl`y-turnedY hook portions at their ends.

In testimony whereof I have hereunto set my hand. y

JAMES B. NE1L. 

